asn1 encoding/decoding

Hy. I am trying to encode a ASN1 structure with DER , but i get a parse error. My in text is : 304913214D617374657220646520736563757269746174656120696E666F726D6174696569301E170D3039313030313030303030305A170D3130303331353030303030305A020103010101